A detection limit calculation device is provided that includes a calculation means that calculates, for image capture of a radiographic image of an imaging subject using an image capture means, a detection limit of a detection means that detects whether irradiation of radiation has started based on a radiation amount of radiation including radiation that has been irradiated and passed through the imaging subject, based on imaging subject data relating to the imaging subject or irradiation data relating to irradiation of radiation or both thereof.
